<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>切角效果</title>
  <style>
    .box {
      width: 200px;
      height: 400px;
      text-align: center;
      line-height: 400px;
      background: linear-gradient(-45deg, transparent 15px, pink 0) right bottom,
      linear-gradient(45deg, transparent 15px, pink 0) left bottom ,
      linear-gradient(135deg, transparent 15px, pink 0) top left,
      linear-gradient(-135deg, transparent 15px, pink 0) top right;
      background-size: 50% 50%;
      background-repeat: no-repeat;
    }
  </style>
</head>
<body>
<div class="box">BEVEL-CORNER</div>
</body>
</html>